MailRedirect may do that for Thunderbird: http://mailredirect.mozdev.org/ and https://addons.mozilla.org/en-us/thunderbird/addon/mail-redirect/ though comments sound like it doesn't work with the recent Thunderbird build.

Full agreed. My favourite examples of fairly recent games with decent multiplayer coop: Trine (3 players, jump'n' run) Lara Croft and the guardian of light (2 players, isometric view) The Undergarden (2 players, trippy, relaxing)

Alternative for chrome users: Facebook Disconnect. Blocks all traffic to facebook servers, but still lets you access facebook.

IIRC the technique described by the GP is being used by Dolby3D and has been developed a while ago in some Daimler research lab. Apparently it is very competitive to the RealD stuff. The filters for the glasses may be a bit more expensive to produce as they'd have to be very accurate.